and some new developments in the decades-old search for teamsters' boss, jimmy hoffa. police in detroit have received a new trip that hoffa is buried under the driveway you see there. they're now taking soil samples. thousands of tips have come in when hoffa vanished in 1975. >>> finally, the prime minister of great britain, perhaps a little embarrassed this morning. he was on david letterman last night. got a pop quiz on british history. he did rather well. but he missed two. he knew which year the magna carta was signed. but he didn't know what magna carta meant. it means great charter. he also couldn't name the composer of "rule britannia." that composer is? thomas arnes. i'm going to guess there aren't a ton of brits that know it, either. on par, he can be excused. >> a pop quiz. >> nose are the only two he missed. >> little high-risk for a british prime minister on letterman. josh, thanks. >>> the race for the white house. "your voice, your vote" with 40 days to go. and president obama has opened up his biggest lead yet in gallup's daily poll, six points. that put